import React, { Component } from "react";
import PropTypes from 'prop-types'
import { nanoid } from "nanoid";
import './index.css'
export default class Header extends Component {
  static propTypes={
    addTodo:PropTypes.func.isRequired
  }
  handleKeyUp=(event)=>{
    const {keyCode,target} = event;
    if(keyCode===13){
      if(target.value.trim()==='') return alert('输入值不能为空');
      const todoObj={id:nanoid(),name:target.value,done:false}
      this.props.addTodo(todoObj);
      //置空输入框
      target.value='';
    }
  }
  render() {
    return (
      <div className="todo-header">
        <input onKeyUp={this.handleKeyUp} type="text" placeholder="请输入你的任务名称，按回车键确认" />
      </div>
    );
  }
}
